package com.situ.web.filter;

import javax.servlet.*;
import javax.servlet.annotation.WebFilter;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import java.io.IOException;

@WebFilter(filterName = "encoding",urlPatterns = "/*")
public class EncodingFilter implements Filter {
    @Override
    public void init(FilterConfig filterConfig) throws ServletException {
        System.out.println("EncodingFilter.init");
    }

    @Override
    public void doFilter(ServletRequest servletRequest, ServletResponse servletResponse, FilterChain filterChain) throws IOException, ServletException {
        System.out.println("EncodingFilter.doFilter");
        HttpServletRequest httpServletRequest = (HttpServletRequest)servletRequest;
        String method = httpServletRequest.getMethod();
        if(method.equalsIgnoreCase("post")){
            httpServletRequest.setCharacterEncoding("UTF-8");
        }
        //如果是post请求，处理完乱码后，继续沿着过滤连执行
        filterChain.doFilter(servletRequest,servletResponse);
    }

    @Override
    public void destroy() {
        System.out.println("EncodingFilter.destroy");
    }
}
